Step 1: LM potencies are called 50 Millesimal scale potencies.
Step 2: Hahnemann introduced them in the 6th edition of Organon for gentle, repeated doses.
Step 3: They are denoted as LM 1, LM 2, etc., prepared by 1/50,000 dilutions.
So, the answer is (C) 50 Millesimal.